span code for adding lock unlock and all other icons on confluence page

[sanfx]

Hi,

I have written a tool that publishes html code and using confluence rest api adds to page of specific id,

in my page I have a situation where I need to put icons like lock, unlock etc

I discovered use of <span> tag to build a green tick 

<span class="aui-icon aui-icon aui-icon-small aui-iconfont-approve confluence-information-macro-icon"></span>

I need to know this list of all available icons using span.